99extra Underwear, 15 Styles Men's Mesh Bamboo Fiber Antimicrobial Boxer Briefs 95% bamboo Fiber/5% Spandex Imported Bamboo fiber has particular and natural functions of anti-bacteria and deodorization It is validated by Japan Textile Inspection Association that, even after fifty times of washing, bamboo fiber fabric still possesses excellent function of anti-bacteria. Bamboo fiber's natural anti-bacteria function differs greatly from that of chemical anti-microbial. According to authoritative testing figures, apparels made from bamboo fibers are 1-2 degrees lower than normal apparels in hot summer. Suitable for hand washing. To prevent repeated rubbing washing with big strength. Preferably on the delicates cycle, and don't use bleach or fabric softener. Neutral detergent can prolong the life cycle of underwear.